Portable testing unit



FIG. 1 is a top perspective front view of a portable testing unit showing the design with a lid, which is hinged, in a closed position;

FIG. 2 is a right side view of the portable testing unit of FIG. 1, with the hinged lid in the closed position;

FIG. 3 is a top view of the portable testing unit of FIG. 1, with the hinged lid in the closed position;

FIG. 4 is a front view of the portable testing unit of FIG. 1, with the hinged lid in the closed position;

FIG. 5 is a rear view of the portable testing unit of FIG. 1, with the hinged lid in the closed position; and,

FIG. 6 is a top perspective front view of the portable testing unit of FIG. 1, with the hinged lid in an open position.

The left side view is a mirror image of the right side view.

The broken lines in the drawings illustrate features of the portable testing unit that form no part of the claim. 

CLAIM The ornamental design for a portable testing unit, as shown and described. 